#include <stdio.h>

int main()
{
  perror("error:");
  fprintf(stdout,"hello fprintf stdout\n");
  fprintf(stderr,"hello fprintf stderr\n");
  //fprintf(stdout,"hello fprintf stdout\n");
  //fprintf(stderr,"hello fprintf stderr\n");
  //fprintf(stdout,"hello fprintf stdout\n");
  //fprintf(stderr,"hello fprintf stderr\n");
  //fprintf(stdout,"hello fprintf stdout\n");
  //fprintf(stderr,"hello fprintf stderr\n");
  //fprintf(stdout,"hello fprintf stdout\n");
  //fprintf(stderr,"hello fprintf stderr\n");
  return 0;
}
